Guava Optional type, when transformation returns another Optional

Question

I have a method that procudes an Optional

But this String must be parsed at another application level as Integer or Long.

This I h

Answer 1

Using Optional.transform just doesn't seem compatible with a transformation that might fail - theoretically this implies an optional optional, when what you want to do is consolidate absences. I would recommend using something like the following:

Optional strOptional = Optional.of("Toto");
Optional intOptional =
        strOptional.isPresent()
        ? Optional.fromNullable(Ints.tryParse(strOptional.get()))
        : Optional.absent();